1 Provide and use decay-free posts as follows:
wider than ½ in [12 mm] or longer than 1½ in [38 mm];
for the full post length and no wider than ¼ in [6 mm] or deeper than 2 in [50 mm] through the bolt hole;
in diameter, per 6 ft [2 m] of post length;
post length; and
2 in [50 mm]; trim allowable scars. 813.6.2.2 Dimensioned Posts and Blocks 1 For timber posts and blocks, provide as rough sawn or surfaced four sides (S4S).
813.6.3 Steel Posts
For steel guardrail posts, provide and use in the specified length and section, in accordance with ASTM A 36 [ASTM A 36M], and galvanized in accordance with AASHTO M 111 [AASHTO M 111M].
726
Water
814.1Water
814.1.1 General 1 Provide and use clean water free of oil, salt, acid, alkali, algae, sugar, vegetable, or other
deleterious substances. 814.1.2 Water for Concrete 1 For concrete, provide and use mixing or curing water in accordance with Table 814.1.2-
1, Properties of Water For Concrete; do not neutralize by chemical additives. The engineer may allow the use of water known to be potable.
Property
Table 814.1.2-1 Properties of Water For Concrete Specification
Chlorideion, ppm Hydrogenion (1), pH
Min
Max
ASTM D 512, method B
–
1000
AASHTO T 26, acidity method B
4.5
8.5
(1)
If pH is not within range, compare mortar specimens prepared from source and distilled water in accordance with Table 814.1.2-2, Properties of Mortar Specimens.
Property
Table 814.1.2-2 Properties of Mortar Specimens Specification
Autoclave expansion, % AASHTO T 107 (1) Vicat time of setting, minutes AASHTO T 131 (2) Compressive strength, lb/in2 [MPa] AASHTO T 106 (3) (1) Determine difference in results (Source - Distilled); nearest 0.01%. (2)
Max 1000 34.0, initial; 56.0 final 10% reduction
Determine difference in results (Source - Distilled); nearest 0.1 minute.
(3)
Determine the percent reduction in compressive strength as equal to (100.0 ×{(Source Distilled)/Distilled}); nearest 0.1%.
727
Structural Metals and Metal Castings
815.1Structural Steel
1 Ensure the provision and use of structural carbon steel in accordance with ASTM A
709, grade 36 [ASTM A 709M, grade 250]. 2 Ensure the provision and use of high-strength, low-alloy structural steel in accordance
with ASTM A 709, grade 50, 50S, or 50W [ASTM A 709M, grade 345, or 345W]. 3 Ensure the provision and use of high-performance steel in accordance with ASTM A
709, grade HPS70W [ASTM A 709M, grade HPS485W]. 4 For non-fracture critical main girders for highway bridges, ensure the provision and use
of structural steel for W-shape rolled beams, webs and all flanges of welded-plate girders, splice plates, and other primary members are in accordance with the impact test requirements of ASTM A 709 [ASTM A 709M], table 11 for zone 2. 5 For all fracture critical members, ensure the provision and use of structural steel in
accordance with the impact test requirements of ASTM A 709 [ASTM A 709M], table 12 for zone 2.
815.2High-Strength Bolts and Fasteners
815.2.1 Bolts, Nuts, and Washers 1 Ensure the provision and use of high-strength bolts, nuts, and washers as follows:
maximum Rockwell C hardness of 33. For unpainted ASTM A 709 grade 50W or HPS70W [ASTM A 709M, grade 345W or HPS485W] steel, use only type 3 bolts. Mark bolts “A325” and with a symbol identifying the manufacturer; for type 3 bolts, underline the mark as follows: “A325.” Mark metric bolts “A325M” and with a symbol identifying the manufacturer; for type 3 bolts, underline the mark as follows: “A325M.” Mark twist-off bolts “A325TC” and with a symbol identifying the manufacturer; for type 3 bolts, under the mark as follows: “A325TC”.
728
Structural Metals and Metal Castings